Bash aliases and helpers

My ~/.bash_profile file contains these helpers and aliases.
# Display current git branch, nicely colored, in the prompt (with a * if there are changes)
function parse_git_dirty {
  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "*"
}
function parse_git_branch {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/[\1$(parse_git_dirty)]/"
}
export PS1='\u:\[\033[31;40m\]\w\[\033[0;33m\]$(parse_git_branch)\[\e[0m\]$ '

export EDITOR='mate -w'

export PATH=$PATH:/usr/local/rvm/bin:~/bin
 [[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"

# colorize terminal
export CLICOLOR=1
export LSCOLORS=GxFxCxDxBxegedabagaced

# Find running processes, e.g.:
#   $ psx chrome
alias psx='ps aux | grep $1'


# Recursive full text search, e.g.:
#   $ g somestring app/
alias g='grep -rn'
export GREP_OPTIONS='--color=auto'

# Output my current IP address (thanks @hmason), e.g.:
#   $ whatsmyip
alias whatsmyip='curl http://automation.whatismyip.com/n09230945.asp'


# Open man pages in Preview (thanks @brynary), e.g.:
#   $ pman grep
pman () {
    man -t "${1}" | open -f -a /Applications/Preview.app
}

# Who hosts that site (thanks @jcn), e.g.:
#   $ whohosts foursquare.com
whohosts () {
  whois `/opt/local/lib/mysql5/bin/resolveip -s $*`;
}

# exclude tmp/ and log/ when opening a rails project in textmate
alias mater="ls | grep -Ev 'log|tmp' | xargs mate"

# via @desandro http://desandro.github.com/dropshado.ws/
alias glog="git log --format='%Cgreen%h%Creset %C(cyan)%an%Creset - %s' --graph"